org.springframework.expression.spel.ast

Class Elvis

java.lang.Object

org.springframework.expression.spel.ast.SpelNodeImpl

org.springframework.expression.spel.ast.Elvis

All Implemented Interfaces:

SpelNode

public class Elvis
extends SpelNodeImpl

Represents the elvis operator ?:. For an expression "a?:b" if a is not null, the value of the expression is "a", if a is null then the value of the expression is "b".

Since:

3.0

Author:

Andy Clement

Field Summary

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

children, pos

Constructor Summary

Constructors

Constructor and Description
Elvis(int pos, SpelNodeImpl... args)

Method Summary

Modifier and Type	Method and Description
TypedValue	getValueInternal(ExpressionState state) Evaluate the condition and if not null, return it.
String	toStringAST()

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl

getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, getValueRef, isWritable, nextChildIs, setValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Elvis

public Elvis(int pos,
             SpelNodeImpl... args)

Method Detail

getValueInternal

public TypedValue getValueInternal(ExpressionState state)
                            throws EvaluationException

Evaluate the condition and if not null, return it. If it is null return the other value.

Specified by:

getValueInternal in class SpelNodeImpl

Parameters:

state - the expression state

Throws:

EvaluationException - if the condition does not evaluate correctly to a boolean or there is a problem executing the chosen alternative

toStringAST

public String toStringAST()

Specified by:

toStringAST in interface SpelNode

Specified by:

toStringAST in class SpelNodeImpl

Returns:

the string form of this AST node